CPU/Recompiler: Don't use intepreter icache when falling back

Fixes broken rendering in TOCA 2.

It has self-modifying code every frame, which gets falled back to the
interpreter, and using the interpreter's icache, which resulted in
stale code executing.

src/core/cpu_core_private.h

@@ -100,6 +100,7 @@ ALWAYS_INLINE VirtualMemoryAddress PhysicalAddressToVirtual(PhysicalMemoryAddres
 
 // defined in bus.cpp - memory access functions which return false if an exception was thrown.
 bool FetchInstruction();
+bool FetchInstructionForInterpreterFallback();
 bool SafeReadInstruction(VirtualMemoryAddress addr, u32* value);
 bool ReadMemoryByte(VirtualMemoryAddress addr, u8* value);
 bool ReadMemoryHalfWord(VirtualMemoryAddress addr, u16* value);